JP5122849B2 - Wiper device - Google Patents

Description

  The present invention relates to a wiper device that drives a pair of wiper arms and wipes a windshield provided in a vehicle.

  A vehicle such as an automobile is equipped with a wiper arm having a wiper blade in order to wipe off deposits such as rain and snow attached to the windshield. The wiper arm swings on the windshield by a wiper device mounted on the vehicle. The wiper device includes a pivot shaft to which the wiper arm is fixed and an electric motor that swings the pivot shaft. The wiper blade wipes the windshield by swinging the pivot shaft by the electric motor. It has become.

  A wiper device having a pair of wiper arms such as a tandem type and a counter wiping type is provided with a pair of pivot shafts corresponding to each wiper arm, and each pivot shaft is driven by an electric motor through a link mechanism. As such a wiper device, a pair of pivot holders that rotatably support each pivot shaft are fixed to both ends of a pipe-shaped frame member, and an electric motor is attached to a substantially central portion of the frame member via a motor bracket. There is a so-called frame-integrated wiper device (modular wiper device) which is fixed and unitized.

As such a modular wiper device, for example, the one described in Patent Document 1 is known. In this wiper device, an insertion portion (support pin) is formed by projecting into a motor bracket (housing), and the insertion portion is inserted into an insertion hole formed in a vehicle-side panel via a grommet so that the wiper device is placed in a predetermined position on the vehicle. It is designed to be positioned. The wiper device can be mounted at a predetermined position of the vehicle by fixing each pivot holder to the vehicle-side panel with a bolt.
JP 2000-289576 A (FIG. 1)

  However, according to the wiper device described in Patent Document 1 described above, the output shaft of the electric motor is disposed at a position that is relatively far away from the line segment that connects the axes of the pivot shafts. Therefore, when the wiper device is driven when the frictional force of the wiper blade against the windshield is large or when snow or the like remains in the swinging direction of the wiper arm, the motor bracket is attached to the frame by the reaction force of the electric motor acting on the motor bracket. There exists a problem that it becomes easy to incline with respect to a member.

  If the wiper device is repeatedly driven in this state, repeated relative displacement of the insertion portion with respect to the panel will quickly wear the grommet between the insertion portion and the panel, increasing the backlash between the insertion portion and the panel. Not only does abnormal noise occur due to direct contact, etc., but the generated abnormal noise is transmitted to the vehicle interior and becomes harsh.

  An object of the present invention is to provide a wiper device that can suppress an increase in the amount of play with respect to the panel of the insertion portion and can reduce the occurrence of abnormal noise due to direct contact between the two.

A wiper device according to the present invention is a wiper device that drives first and second wiper arms to wipe a windshield provided in a vehicle, and includes an electric motor having an output shaft, and a crank having one end fixed to the output shaft. A motor bracket having an insertion portion that is attached to the vehicle and is mounted and fixed to the vehicle, a first frame member that is fixed to the motor bracket, and an other end fixed to the other end of the first frame member A first pivot holder, a first pivot shaft rotatably mounted on the first pivot holder, a first link plate having one end fixed to the first pivot shaft, and one end attached to the motor bracket. fixed, and the second frame member substantially set to the same length as the first frame member is fixed to the other end of said second frame member A second pivot shaft rotatably mounted on the second pivot holder, a second link plate having one end fixed to the second pivot shaft, and both ends of the first and second pivot plates. A link rod that is rotatably connected to the other end of the link plate, one end is rotatably connected to the other end of either the first or second link plate, and the other end is the crank arm. A drive link rotatably connected to the other end of the output shaft, and a perpendicular distance from the axis of the output shaft to the line connecting the axes of the first and second pivot shafts is A, and the insertion The relationship of A / B ≦ 0.4 is satisfied, where B is the distance of the perpendicular from the portion to the line segment.

  The wiper device of the present invention satisfies the relationship of A / B ≦ 0.3.

  According to the present invention, when the distance of the perpendicular from the axis of the output shaft to the line connecting the axes of the first and second pivot shafts is A, and the distance of the perpendicular from the insertion portion to the line is B In addition, since the relationship of A / B ≦ 0.4 is satisfied, the axis center of the output shaft and the line segment connecting the shaft centers of the first and second pivot shafts can be brought close to each other. Therefore, when the wiper device is driven, the inclination of the motor bracket with respect to each frame member can be suppressed, and an increase in the amount of play with respect to the panel of the insertion portion can be suppressed, so that the generation of noise due to direct contact between the two is suppressed. Can be reduced. More preferably, the relationship between the distance A and the distance B is set so as to satisfy A / B ≦ 0.3. In this case, an increase in the amount of play between the two and the occurrence of abnormal noise can be further suppressed.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view showing a part of a vehicle provided with a wiper device according to the present invention, FIG. 2 is an enlarged front view showing the wiper device of FIG. 1, and FIG. 3 is a pivot shaft, an output shaft and a plug 4 is an explanatory diagram for explaining the positional relationship of the parts, and FIG. 4 is an evaluation diagram showing the evaluation of a plurality of examples in which the positional relationship of FIG.

  As shown in FIG. 1, the vehicle 10 is provided with a windshield 11 as a windshield. Further, the vehicle 10 is provided with a driver seat side (DR side) wiper blade 12a and a passenger seat side (AS side) wiper blade 12b for wiping the windshield 11. The DR-side wiper blade 12a is attached to the tip of the DR-side wiper arm 13a, and the AS-side wiper blade 12b is attached to the tip of the AS-side wiper arm 13b. Each of the wiper blades 12a and 12b is in elastic contact with the windshield 11 by a coil spring (not shown) or the like that is housed in each of the wiper arms 13a and 13b.

  The wiper blades 12a and 12b perform a wiping operation by swinging the DR side and AS side wiping ranges 11a and 11b between the upper inversion position and the lower inversion position on the windshield 11 in the same direction. It has become. That is, the wiping pattern of these wiper blades 12a and 12b is a tandem type.

  The vehicle 10 is provided with a modular wiper device 14 for driving the wiper arms 13a and 13b to perform the wiping operation. The wiper device 14 is provided with a DR side pivot shaft (first pivot shaft) 15a to which the DR side wiper arm 13a is fixed and an AS side pivot shaft (second pivot shaft) 15b to which the AS side wiper arm 13b is fixed. .

  As shown in FIG. 2, the DR side pivot shaft 15a is rotatably mounted on the DR side pivot holder (first pivot holder) 16a, and the AS side pivot shaft 15b is mounted on the AS side pivot holder (second pivot holder) 16b. It is mounted so that it can rotate.

  The DR side pivot holder 16a is bent in the shape of a crank on the right side in the figure, and a pair of rubber bushes 17a and 17b are attached to the bent portion. The DR-side pivot holder 16a is fixed to a panel 19a in the engine room or the like (not shown) of the vehicle 10 by mounting bolts 18a and 18b inserted through the bushes 17a and 17b.

  The AS side pivot holder 16b is bent in the shape of a crank on the left side in the figure, and a rubber bush 20 is attached to the bent portion. The AS-side pivot holder 16b is fixed to a panel 19b in an engine room or the like (not shown) of the vehicle 10 by mounting bolts 21 inserted through the bush 20.

  The DR side pivot holder 16a is integrally formed with a projecting portion 22a so as to project to the left side in the figure, and the projecting portion 22a has a first hollow pipe (first frame member) 23a. The other end is fixed by caulking. Further, the AS-side pivot holder 16b is integrally formed with a protrusion 22b so as to protrude rightward in the drawing, and the protrusion 22b has a second hollow pipe (second frame member). The other end of 23b is fixed by caulking.

  A motor bracket 24 is provided between the first hollow pipe 23a and the second hollow pipe 23b. The motor bracket 24 is integrally formed with a first protrusion 24a and a second protrusion 24b. ing. Then, the first protrusion 24a is attached to one end of the first hollow pipe 23a, the second protrusion 24b is attached to one end of the second hollow pipe 23b, and the hollow pipes 23a and 23b are caulked, respectively. The bracket 24 is fixed to the hollow pipes 23a and 23b.

  The hollow pipes 23a and 23b are set to have substantially the same length, and therefore the motor bracket 24 is arranged at a substantially central portion in the left-right direction of the pivot holders 16a and 16b in the drawing. Yes.

  On the upper side of the motor bracket 24 in the figure, a substantially columnar insertion portion 24c that is inserted into and fixed to an insertion hole 19d formed in the panel 19c in the engine room or the like (not shown) of the vehicle 10 is integrally formed. Has been. A rubber grommet 25 for absorbing play between the insertion hole 24d and the insertion hole 19d is attached to the insertion portion 24c.

  Here, when the wiper device 14 is attached to the vehicle 10, first, as shown by a two-dot chain line arrow in the figure, the insertion portion 24c is inserted into the insertion hole 19d and positioned (temporarily fixed). By tightening the mounting bolts 18a, 18b, and 21, the pivot holders 16a and 16b are fixed to the panels 19a and 19b.

  An electric motor 26 that drives and swings the pivot shafts 15a and 15b is attached to the motor bracket 24. The electric motor 26 includes a motor unit 26a and a speed reduction mechanism unit 26b, and the motor unit 26a is driven by a current supplied from a controller (not shown) connected to the coupler 27. .

  The output of the motor part 26a is input to the speed reduction mechanism part 26b, and is decelerated to a predetermined rotational speed by the speed reduction mechanism part 26b. One end of a crank arm 29 is fixed to the output shaft 28 of the speed reduction mechanism portion 26 b, and the crank arm 29 is rotated about the output shaft 28 by driving the electric motor 26.

  One end of a first link plate 30a and a second link plate 30b is fixed to each pivot shaft 15a, 15b, and a ball joint or the like (not shown) is attached to the other end of each link plate 30a, 30b. Thus, both ends of the pipe-shaped link rod 31 are rotatably connected.

  Also, between the other end of the first link plate 30a and the other end of the crank arm 29, both ends of a pipe-like drive rod (drive link) 32 are rotated via a ball joint or the like (not shown). It is connected freely. However, the drive rod 32 is not limited to be provided between the other end of the first link plate 30 a and the other end of the crank arm 29, and is provided between the other end of the second link plate 30 b and the other end of the crank arm 29. Anyway. In short, as long as the rotational force of the electric motor 26 is transmitted to the wiper arms 13a and 13b, any connection structure of the link rod 31 and the drive rod 32 may be used.

  By forming the link mechanism in this way, as shown by the broken line arrow in FIG. 3, the rotational movement of the crank arm 29 by the drive of the electric motor 26 is caused by the drive rod 32, the link rod 31 and the link plates 30a, 30b. The pivot shafts 15a and 15b can be oscillated by being converted into the oscillating motion.

  As shown in FIG. 3, the wiper device 14 has a perpendicular distance from the axis of the output shaft 28 of the electric motor 26 to a line segment (virtual line) connecting the axes of the pivot shafts 15 a and 15 b as A, When the distance of the perpendicular line from the insertion portion 24c of the motor bracket 24 to the line segment connecting the axes of the pivot shafts 15a and 15b is B, the relationship of A / B ≦ 0.4 is satisfied. .

  As a result, the distance between the axis of the output shaft 28 and the line connecting the axes of the pivot shafts 15a and 15b becomes closer than before, and the electric motor acting on the motor bracket 24 when the electric motor 26 is driven. 26 so that the motor bracket 24 can be prevented from being inclined with respect to the hollow pipes 23a and 23b by the reaction force of 26, that is, the load transmitted from the link plates 30a and 30b via the link rod 31 and the drive rod 32. It has become.

  In FIG. 4, a certain point on the line segment connecting the respective axes of the pivot shafts 15a and 15b is a fixed point, the axis of the output shaft 28 is an operating point where the motor reaction force F acts, and the insertion portion 24c is a stress f. The result of measuring the stress f (N) by setting the length of each distance A, B (mm) to an arbitrary value as the backlash generation point at which the play occurs is shown. The motor reaction force F is set to 400 kgf according to the output characteristics (MAX value) of an electric motor used in a general wiper device.

  As shown in FIG. 4, for Example A and Example B, the values of A / B are “0.52” and “0.51”, respectively, and the stress f at this time is 200 N. It was a big value that exceeded. For Example C and Example D, the values of A / B are “0.40” and “0.35” (A / B ≦ 0.4), respectively. The value was below 200N. In Examples E to H, the values of A / B are “0.29”, “0.26”, “0.24”, and “0.22” (A / B ≦ 0.3, respectively). The stress f at this time was a small value near 100N.

  Among Examples A to H, in Example A and Example B, the inclination of the motor bracket 24 with respect to the hollow pipes 23a and 23b cannot be sufficiently suppressed. The backlash amount with respect to the insertion hole 19d of the part 24c becomes large, and there is a possibility that both of them come into direct contact at an early stage and abnormal noise is generated. Therefore, it was found that Example A and Example B were difficult to actually adopt (determination “x”).

  Moreover, in Example C and D, compared with Example A and Example B, the inclination with respect to each hollow pipe 23a, 23b of the motor bracket 24 can fully be suppressed, and with respect to the insertion hole 19d of the insertion part 24c. The amount of play can be reduced. Therefore, the rigidity of the motor bracket 24 can be reduced to some extent to reduce the size and weight, and the wiper device 14 is highly feasible (determination “◯”).

  Furthermore, in Example E to Example H, it is possible to further suppress the inclination of the motor bracket 24 with respect to the hollow pipes 23a and 23b as compared with Examples C and D. Therefore, the motor bracket 24 can be further reduced in size and weight, and the wiper device 14 can be made more feasible (determination “◎”).

  According to the wiper device 14 according to the present embodiment configured as described above, the perpendicular distance from the axis of the output shaft 28 to the line connecting the axes of the DR side and AS side pivot shafts 15a and 15b is represented by A. Since the relationship of A / B ≦ 0.4 is satisfied when the perpendicular distance from the insertion portion 24c to the line segment is B (determination “◯” and determination “「 ”), the output shaft The 28 axial centers and the line segments connecting the axial centers of the DR side and AS side pivot shafts 15a and 15b can be brought close to each other.

  Therefore, when the wiper device 14 is driven, the inclination of the motor bracket 24 with respect to the hollow pipes 23a and 23b can be suppressed, and an increase in the amount of play with respect to the insertion hole 19d of the insertion portion 24c can be suppressed, so that both are in direct contact with each other. It is possible to reduce the occurrence of abnormal noise due to the operation. More preferably, the relationship between the distance A and the distance B should satisfy A / B ≦ 0.3 (determination “◎”), and in this case, between the insertion portion 24c and the insertion hole 19d. The increase in the amount of play and the generation of abnormal noise can be further suppressed.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the wiping pattern of the wiper device 14 is shown as a tandem type. However, the present invention is not limited to this, and may be applied to a wiper device having another wiping pattern such as a counter wiping type. You can also.

  Moreover, in the said embodiment, although the wiper apparatus 14 mounted in a motor vehicle was shown, this invention is not restricted to this, It can also apply to wiper apparatuses, such as a railway vehicle, an aircraft, and a construction machine.

It is explanatory drawing which shows a part of vehicle provided with the wiper apparatus which concerns on this invention. It is a front view which expands and shows the wiper apparatus of FIG. It is explanatory drawing explaining the positional relationship of a pivot axis | shaft, an output shaft, and an insertion part. FIG. 4 is an evaluation diagram showing evaluation of a plurality of examples in which the positional relationship in FIG. 3 is varied.

Explanation of symbols

10 Vehicle 11 Windshield (windshield)
11a DR side wiping range 11b AS side wiping range 12a DR side wiper blade 12b AS side wiper blade 13a DR side wiper arm (first wiper arm)
13b AS side wiper arm (second wiper arm)
14 Wiper device 15a DR side pivot shaft (first pivot shaft)
15b AS side pivot shaft (second pivot shaft)
16a DR side pivot holder (first pivot holder)
16b AS side pivot holder (second pivot holder)
17a, 17b Bush 18a, 18b Mounting bolt 19a-19c Panel (vehicle)
19d Insertion hole 20 Bush 21 Mounting bolt 22a, 22b Protruding portion 23a First hollow pipe (first frame member)
23b Second hollow pipe (second frame member)
24 motor bracket 24a first protrusion 24b second protrusion 24c insertion part 25 grommet 26 electric motor 26a motor part 26b reduction mechanism part 27 coupler 28 output shaft 29 crank arm 30a first link plate 30b second link plate 31 link rod 32 Drive rod (drive link)
A, B Distance F Motor reaction force f Stress

Claims (2)

A wiper device for driving a first and second wiper arm to wipe a windshield provided in a vehicle,
An electric motor having an output shaft;
A crank arm having one end fixed to the output shaft;
A motor bracket mounted with the electric motor and having an insertion portion to be inserted and fixed to the vehicle;
A first frame member having one end fixed to the motor bracket;
A first pivot holder fixed to the other end of the first frame member;
A first pivot shaft rotatably mounted on the first pivot holder;
A first link plate having one end fixed to the first pivot shaft;
A second frame member, one end of which is fixed to the motor bracket and set to have substantially the same length as the first frame member;
A second pivot holder fixed to the other end of the second frame member;
A second pivot shaft rotatably mounted on the second pivot holder;
A second link plate having one end fixed to the second pivot shaft;
Link rods whose both ends are rotatably connected to the other ends of the first and second link plates,
A drive link having one end rotatably connected to the other end of either the first or second link plate and the other end rotatably connected to the other end of the crank arm;
When the distance of the perpendicular from the axis of the output shaft to the line connecting the axes of the first and second pivot shafts is A, and the distance of the perpendicular from the insertion portion to the line is B, A wiper device satisfying a relationship of A / B ≦ 0.4. 2. The wiper device according to claim 1, wherein a relationship of A / B ≦ 0.3 is satisfied.

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